R/V Ronald H. Brown Daily Summaries

Daily Summary July 13, 2002, DOY = 194

Overcast skies with an occasional shower. Seas building throughout the day with winds from the East. Routine science team meetings at 800 and 1900 (EDT) have been initiated. Reports from the PI's indicate that most of the measurements aboard the ship are operational. The flow is from the clean marine sector with very low levels of pollution reported by most sensors. Ozone levels were typically in the 30-40 ppb range both at the surface and aloft. Large aerosols were dominated by sea salt. Low levels of aerosol sulfate, ammonium and organics were detected in particles less than 400 nm aerodynamic diameter.

Preliminary analysis indicate that levels of short-lived, reactive species such as NO and reactive hydrocarbons
are very low as would be expected. Carbon monoxide appears to be somewhat elevated for this region with levels around 200 ppb.
Substantial levels of acetone are also being seen (~1ppb) and appear to be decreasing slowly as we progress northward.
Similar levels and trends are also observed in methanol. The ship rounded Cape Hatteras at 1700 ET and proceeded to a point off New Jersey (N39 47.4, W 72 11.0).